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3A Single Cell Switching Battery Charger Evaluation Board

EVB_RT9471DGQW(2)

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The RT9471D is a highly-integrated 3A switch mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.

General Description

The RT9471D is a highly-integrated 3A switch mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer battery. The low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I2C serial interface with charging and system settings makes the device a truly flexible solution.



Performance Sepcification Summary

Summary of the RT9471D Evaluation Board performance specificiaiton is provided in Table 1. The ambient temperature is 25°C.


Table 1. RT9471D Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min

Typ

Max

Unit

Input Voltage Range, VBUS

3.9

--

13.5

V

Maximum Input Current, IBUS

0

--

3.2

A

Maximum Input Current, IBUS

VBUS ≥ 12V

--

--

2

A

Maximum Output Current, ISYS

--

--

3.2

A

Maximum Battery Voltage, VBAT

--

--

4.7

V

Maximum Charge Current, IBAT

--

--

3.15

A

Maximum Discharge Current, IBAT

--

--

6

A



Power-up Procedure

Suggestion Required Equipments

  • RT9471D Evaluation Board
  • DC power supply x 2, one for VBAT, one for VBUS
  • Electronic load
  • Oscilloscope

Quick Start Procedures

The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made.

Proper measurement equipment setup and follow the procedure below.

1. Set power source equal 3.8V/5A then connect to BAT and GND of EVB.

2. Use E-Load connect to power source and enable CC loading from power source.

3. The AP connect to SCL, SDA and GND of EVB

4. Check I2C can work normally by connecting to slave address (0x53).

5. Set VBUS = 5V/3A and connect to VBUS and GND of EVB.

6. Check have charging current to VBAT.

7. Check 0x0F[3:0] shows ‘0100’ (Fast-charge)

8. Start the test by changing register setting which you want.



Detailed Description of Hardware

Headers Description and Placement

一張含有 文字, 電路, 螢幕擷取畫面, 電子工程 的圖片

自動產生的描述

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.


Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test Point/

Pin Name

Function

VBUS

Input voltage.

SYS

System voltage.

BAT

Battery voltage.

SW

Switching node.

REGN

Internal LDO.

PMID

PMID from VBUS.

BTST

Boost strap pin.

INT

Interupt pin.

SDA

I2C SDA.

SCL

I2C SCL.

/QON

Power key.

VAC

Input sense.

/CE

Charger enable or disable.

D+

Positive of USB data line.

D-

Negative of USB data line.

TS

Temperature sense voltage.



Bill of Materials

Reference

Count

Part Number

Description

Package

Vendor

C1

1

GRM155R61E105KA12

1µF/25V/X5R/0402

0402

Murata

C3

1

GRM155R60J475ME47

4.7µF/6.3V/X5R/0402

0402

Murata

C4

1

GRM033R61C473KE84

47nF/16V/X5R/0201

0201

Murata

C5, C6, C7

2

GRM185R60J106ME15

10µF/6.3V/X5R/0603

0603

Murata

C10

1

GRM188R61E106MA73

10µF/25V/X5R/0603

0603

Murata

J102

1

HSEC8-110-01-S-DV-A-TR

CONN EDGE DUAL FMALE 20POS 0.8mm

12.6x7.98mm

SAMTEC

L1

1

CIGT252010EH1R0MNE

1µH

L-2-5x2-0

Samsung

LED1, LED2

2

LNL-302RD000A1

LED_RED-DIP

LED-3-85MMDIP

LighTop

PD1

1

121U-3CST-09CR

USB TYPE-C 3.1

9.87x9.75mm

JEM

POWER

ON

1

HTS6601H

SW-TACT-SWITCH

TACT-BTN

High-Tronics

R3, R6,

R11, R12

4

WR06X1002FTL

10k/0603

0603

WALSIN

R8

1

WR06X4701FTL

4.7k/0603

0603

WALSIN

R9

1

WR06X5231FTL

5.23k/0603

0603

WALSIN

R10

1

WR06X3012FTL

30.1k/0603

0603

WALSIN

R21, R22

2

WR06X2001FTL

2k/0603

0603

WALSIN

U1

1

RT9471DGQW(2)

RT9471DGQW(2)

WQFN-24L 4x4

RichTek

USB2

1

UMMBF-051MGCB2-CF1066

MICRO USB AB TYPE, SMT

7.4x5.63mm

Cherng Weei



Typical Applications

EVB Schematic Diagram

Technical Document Image Preview


1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple and stability.

2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors will have much lower capacitance.


Measure Result

Power –Up with VBUS Plug In

Charge Enable

Technical Document Image Preview

Technical Document Image Preview

Charge Disable

Boost Start-Up

Technical Document Image Preview

Technical Document Image Preview

AICC Enable

Charger Efficiency, VBAT = 3.8V

Technical Document Image Preview

Technical Document Image Preview

Charger Efficiency, VBAT = 4.2V

Boost Efficiency

Technical Document Image Preview

Technical Document Image Preview



Evaluation Board Layout

Figure 1 to Figure 4 are RT9471D Evaluation Board layout.

一張含有 文字, 圖表, 地圖, 方案 的圖片

自動產生的描述

Figure 1. Top View (1st layer)


一張含有 文字, 螢幕擷取畫面, Rectangle, 數字 的圖片

自動產生的描述

Figure 2. PCB Layout—Inner Side (2nd Layer)


一張含有 地圖, 圖表, 螢幕擷取畫面, 方案 的圖片

自動產生的描述

Figure 3. PCB Layout—Inner Side (3rd Layer)


一張含有 文字, 螢幕擷取畫面, 數字, Rectangle 的圖片

自動產生的描述

Figure 4. Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2023/07/14
Bill of Materials 2023/07/14
Schematic 2023/07/14
Gerber File 2023/07/14
Part NumberFree SampleBuy From Authorized Distributor
EVB_RT9471DGQW(2) Not available Buy from Distributor
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